首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   200715篇
  免费   12399篇
  国内免费   6928篇
电工技术   8632篇
技术理论   3篇
综合类   12440篇
化学工业   29934篇
金属工艺   11455篇
机械仪表   10497篇
建筑科学   11673篇
矿业工程   3885篇
能源动力   4031篇
轻工业   15215篇
水利工程   3877篇
石油天然气   5558篇
武器工业   1190篇
无线电   22822篇
一般工业技术   28336篇
冶金工业   7378篇
原子能技术   1513篇
自动化技术   41603篇
  2024年   589篇
  2023年   2091篇
  2022年   4134篇
  2021年   5352篇
  2020年   4110篇
  2019年   3258篇
  2018年   17486篇
  2017年   17103篇
  2016年   13384篇
  2015年   5828篇
  2014年   6933篇
  2013年   7936篇
  2012年   11674篇
  2011年   18765篇
  2010年   16688篇
  2009年   13699篇
  2008年   14934篇
  2007年   15130篇
  2006年   7009篇
  2005年   6735篇
  2004年   4913篇
  2003年   4162篇
  2002年   3517篇
  2001年   2677篇
  2000年   2274篇
  1999年   1829篇
  1998年   1371篇
  1997年   1069篇
  1996年   1040篇
  1995年   879篇
  1994年   658篇
  1993年   513篇
  1992年   363篇
  1991年   336篇
  1990年   211篇
  1989年   178篇
  1988年   159篇
  1987年   91篇
  1986年   75篇
  1985年   53篇
  1983年   38篇
  1980年   37篇
  1968年   44篇
  1966年   42篇
  1965年   46篇
  1959年   42篇
  1958年   37篇
  1957年   36篇
  1955年   64篇
  1954年   68篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
This study investigates quantitatively and qualitatively the sol-gel derived bioactive glass-ceramic system (BGS)—apatite-wollastonite (AW) type granules in the size range of 0.5–1 mm, as an effective graft material for bone augmentation and restoration. Scanning electron micrographs (SEM) of the sintered granules revealed the rough material surface with micropores in the range 10–30 μm. X-ray diffraction (XRD) pattern of the granules revealed the presence of crystalline phases of the hydroxyapatite and wollastonite, and the functional groups of the silicate and phosphates were identified by Fourier transform infrared spectroscopy (FT-IR). Thein vitro cell culture studies with L929 mouse fibroblast cell line showed very few cells adhered on the BGS disc after 24 h. This could be due to the highly reactive surface of the disc concomitant with the crystallization but not due to the cytotoxicity of the material, since the cellular viability (MTT assay) with the material was 80‰ Cytotoxicity and cytocompatibility studies proved that the material was non-toxic and biocompatible. After 12 weeks of implantation of the BGS granules in the tibia bone of New Zealand white rabbits, the granules were found to be well osteointegrated, as observed in the radiographs. Angiogram with barium sulphate and Indian ink after 12 weeks showed the presence of microcapillaries in the vicinity of the implant site implicating high vascularity. Gross observation of the implant site did not show any inflammation or necrosis. SEM of the implanted site after 24 weeks revealed good osteointegration of the material with the newly formed bone and host bone. New bone was also observed within the material, which was degrading. Histological evaluation of the bone healing with the BGS granules in the tibial defect at all time intervals was without inflammation or fibrous tissue encapsulation. After 2 weeks the new bone was observed as a trabeculae network around the granules, and by 6 weeks the defect was completely closed with immature woven bone. By 12 weeks mature woven bone was observed, and new immature woven bone was seen within the cracks of the granules. After 24 weeks the defect was completely healed with lamellar bone and the size of the granules decreased. Histomorphometrically the area percentage of new bone formed was 67.77% after 12 weeks and 63.37% after 24 weeks. Less bone formation after 24 weeks was due to an increased implant surface area contributed by the material degradation and active bone remodeling. The osteostimulative and osteoconductive potential of the BGS granules was established by tetracycline labelling of the mineralizing areas by 2 and 6 weeks. This sol-gel derived BGS granules proved to be bioactive and resorbable which in turn encouraged active bone formation.  相似文献   
52.
实施六大工程打造民生水利   总被引:1,自引:1,他引:0  
梁滨 《中国水利》2007,(23):5-6
我省针对十年九旱、水资源短缺、生态与环境脆弱的特点,确定了今冬明春农田水利基本建设的目标任务,明确以实施兴水战略为主线,以改善民生为目标,以创新机制为保障,全面掀起冬春农田水利基本建设新高潮。  相似文献   
53.
In this study, distribution and history of residual stresses in plaque-like geometries are simulated based on linear thermoviscoelastic model, which helps to understand the mechanics and evolution of the residual stresses in the injection molding process. The numerical calculation of direction, combined with the specified boundary conditions. Results show that the stress variation across the thickness exhibits a high surface tensile value changing to a compressive peak value close to the surface, with the core region experiencing a parabolic tensile peak. Residual stress distribution throughout the thickness is almost same along the flowpath and the final residual stresses value near the gate is lower than the value near the end of flowpath.  相似文献   
54.
In recent years, the Asia-Pacific region has experienced several financial setbacks, including speculative attacks in 1998 and the SARS outbreak in 2003. Financial stresses of this nature are unanticipated, and not all of the dangers can be predicted by the examination of market information and macroeconomic indicators. The Early Warning System (EWS) that has been adopted by the International Monetary Fund may not be able to predict future financial crises for all possible scenarios, because shocks come in many different forms. To supplement the EWS, this paper proposes a data mining framework to measure the resilience of an economy. The resilience framework does not predict a crisis, but rather assesses the current state of health of an economy and its ability to withstand a financial shock should one occur. The framework is based on a feedback system consisting of two stages. The first stage assigns a resilience score to each economy based on a fuzzy logic scoring scheme that is built on the ambiguous reasoning of experts. The second stage uses the classification tree approach to estimate thresholds for each economic indicator, and examines the quality of the fuzzy score. The result from the second stage is then passed back to the first stage as feedback. The final result is obtained when the feedback system reaches its equilibrium state. The proposed resilience framework is applied to the external-sector and the public-sector economies of several countries to illustrate its applicability.  相似文献   
55.
56.
利用电机学理论分析了影响电机起动转矩、起动电流、最大转矩和最小转矩的因素。  相似文献   
57.
The mechanism and kinetics of β-Ta2O5 chlorination, mixed with sucrose carbon, have been studied by a thermogravimetric technique. The investigated temperature range was 500 °C to 850 °C. The reactants and reaction residues were analyzed by scanning electronic microscopy (SEM), X-ray diffraction (XRD), and Brunauer-Emmett-Teller method for surface area (BET). The effect of various experimental parameters was studied, such as carbon percentage, temperature, chlorine partial pressure, and flow, use of the multiple sample method, and carbon previous oxidation. The carbon percentage and previous treatment have an effect on the system reactivity. The temperature has a marked effect on the reaction rate. In the 500 °C to 600 °C temperature interval, the apparent activation energy is 144 kJ/mol of oxide, while at higher temperatures, the activation energy decreases. With high chorine partial pressures, the order of reaction is near zero. The kinetic contractile plate model, X=kt, considering carbon oxidation as the controlling stage, is the one with the best fit to the experimental data. A probable mechanism for the carbochlorination of β-Ta2O5 is proposed: (1) activation of chlorine on the carbon surface, (2) chlorination of Ta2O5, (3) oxidation of carbon, and (4) recrystallization of β-Ta2O5.  相似文献   
58.
59.
60.
脉冲电镀最佳参数之探索和优化   总被引:3,自引:0,他引:3  
本文利用正交实验法对脉冲电镀各控制参数进行试验,对影响分散能力、镀层可靠性及外观质量的各种因素进行探讨,寻找影响外观质量的显著因子并加以控制,同时进一步优化脉冲电镀的工艺参数。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号